diff --git a/NEWS b/NEWS
index 8d28f6ac..2413cb92 100644
--- a/NEWS
+++ b/NEWS
@@ -21,6 +21,10 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
 # New compact syntax for AttrDef objects that can be used to instantiate
   new objects via make()
 ! HTML Purifier now works in PHP 4.3.2.
+! Configuration form-editing API makes tweaking HTMLPurifier_Config a
+  breeze!
+! Configuration directives that accept hashes now allow new string
+  format: key1,value1,key2,value2
 - Deprecated and removed EnableRedundantUTF8Cleaning. It didn't even work!
 . Unit test for ElementDef created, ElementDef behavior modified to
   be more flexible
diff --git a/TODO b/TODO
index acf2e7d8..e9fb016a 100644
--- a/TODO
+++ b/TODO
@@ -20,7 +20,6 @@ TODO List
  # Reorganize Unit Tests
     - Refactor loop tests (esp. AttrDef_URI)
  - Parse TinyMCE-style whitelist into our %HTML.Allow* whitelists
- ? HTML interface for tweaking configuration to see changes
 
 1.8 release [Refactor, refactor!]
  # URI validation routines tighter (see docs/dev-code-quality.html) (COMPLEX)
diff --git a/configdoc/generate.php b/configdoc/generate.php
index a5b06e96..d01878b8 100644
--- a/configdoc/generate.php
+++ b/configdoc/generate.php
@@ -14,6 +14,11 @@ TODO:
 - factor out code into classes
 */
 
+// there are several hacks for the configForm.php smoketest
+// - load copies (override default schema)
+// - file/line server information hack
+// - post-processing, base-name change hack
+
 // ---------------------------------------------------------------------------
 // Check and configure environment
 
@@ -47,7 +52,15 @@ function appendHTMLDiv($document, $node, $html) {
 // ---------------------------------------------------------------------------
 // Load copies of HTMLPurifier_ConfigDef and HTMLPurifier
 
-$schema = HTMLPurifier_ConfigSchema::instance();
+// hack
+if (defined('HTMLPURIFIER_CUSTOM_SCHEMA')) {
+    // included from somewhere else
+    $var = HTMLPURIFIER_CUSTOM_SCHEMA;
+    $schema = $$var;
+    chdir(dirname(__FILE__));
+} else {
+    $schema = HTMLPurifier_ConfigSchema::instance();
+}
 $purifier = new HTMLPurifier();
 
 
@@ -153,8 +166,11 @@ foreach($schema->info as $namespace_name => $namespace_info) {
         foreach ($info->descriptions as $file => $file_descriptions) {
             foreach ($file_descriptions as $line => $description) {
                 $dom_description = $dom_document->createElement('description');
-                $dom_description->setAttribute('file', $file);
-                $dom_description->setAttribute('line', $line);
+                // hack
+                if (!defined('HTMLPURIFIER_CUSTOM_SCHEMA')) {
+                    $dom_description->setAttribute('file', $file);
+                    $dom_description->setAttribute('line', $line);
+                }
                 appendHTMLDiv($dom_document, $dom_description, $description);
                 $dom_descriptions->appendChild($dom_description);
             }
@@ -203,9 +219,13 @@ if (class_exists('Tidy')) {
     $html_output = (string) $tidy;
 }
 
-// write it to a file (todo: parse into seperate pages)
-file_put_contents("$xsl_stylesheet_name.html", $html_output);
-
+// hack
+if (!defined('HTMLPURIFIER_CUSTOM_SCHEMA')) {
+    // write it to a file (todo: parse into seperate pages)
+    file_put_contents("$xsl_stylesheet_name.html", $html_output);
+} else {
+    $html_output = str_replace('styles/plain.css', HTMLPURIFIER_SCRIPT_LOCATION . 'styles/plain.css', $html_output);
+}
 
 // ---------------------------------------------------------------------------
 // Output for instant feedback
diff --git a/configdoc/styles/plain.xsl b/configdoc/styles/plain.xsl
index cfd5a7ca..eb118778 100644
--- a/configdoc/styles/plain.xsl
+++ b/configdoc/styles/plain.xsl
@@ -76,15 +76,17 @@
         <table class="constraints">
             <xsl:apply-templates />
             <!-- Calculated other values -->
-            <tr>
-                <th>Used by:</th>
-                <td>
-                    <xsl:for-each select="../descriptions/description">
-                        <xsl:if test="position()&gt;1">, </xsl:if>
-                        <xsl:value-of select="@file" />
-                    </xsl:for-each>
-                </td>
-            </tr>
+            <xsl:if test="../descriptions/description[@file]">
+                <tr>
+                    <th>Used by:</th>
+                    <td>
+                        <xsl:for-each select="../descriptions/description">
+                            <xsl:if test="position()&gt;1">, </xsl:if>
+                            <xsl:value-of select="@file" />
+                        </xsl:for-each>
+                    </td>
+                </tr>
+            </xsl:if>
         </table>
     </xsl:template>
     <xsl:template match="directive//description">
diff --git a/library/HTMLPurifier/Config.php b/library/HTMLPurifier/Config.php
index 3c8d0f52..033f069e 100644
--- a/library/HTMLPurifier/Config.php
+++ b/library/HTMLPurifier/Config.php
@@ -147,6 +147,14 @@ class HTMLPurifier_Config
         return $this->conf[$namespace];
     }
     
+    /**
+     * Retrieves all directives, organized by namespace
+     */
+    function getAll() {
+        if (!$this->finalized && $this->autoFinalize) $this->finalize();
+        return $this->conf;
+    }
+    
     /**
      * Sets a value to configuration.
      * @param $namespace String namespace
diff --git a/library/HTMLPurifier/ConfigSchema.php b/library/HTMLPurifier/ConfigSchema.php
index 1e58f196..f97ddf05 100644
--- a/library/HTMLPurifier/ConfigSchema.php
+++ b/library/HTMLPurifier/ConfigSchema.php
@@ -8,6 +8,7 @@ require_once 'HTMLPurifier/ConfigDef/DirectiveAlias.php';
 
 /**
  * Configuration definition, defines directives and their defaults.
+ * @note If you update this, please update Printer_ConfigForm
  * @todo The ability to define things multiple times is confusing and should
  *       be factored out to its own function named registerDependency() or 
  *       addNote(), where only the namespace.name and an extra descriptions
@@ -304,6 +305,7 @@ class HTMLPurifier_ConfigSchema {
         if ($allow_null && $var === null) return null;
         switch ($type) {
             case 'mixed':
+                //if (is_string($var)) $var = unserialize($var);
                 return $var;
             case 'istring':
             case 'string':
@@ -344,6 +346,14 @@ class HTMLPurifier_ConfigSchema {
                     $var = explode(',',$var);
                     // remove spaces
                     foreach ($var as $i => $j) $var[$i] = trim($j);
+                    if ($type === 'hash') {
+                        // key,value,key,value
+                        $nvar = array();
+                        for ($i = 0, $c = count($var); $i + 1 < $c; $i += 2) {
+                            $nvar[$var[$i]] = $var[$i + 1];
+                        }
+                        $var = $nvar;
+                    }
                 }
                 if (!is_array($var)) break;
                 $keys = array_keys($var);
diff --git a/library/HTMLPurifier/Printer.php b/library/HTMLPurifier/Printer.php
index 8325ff45..95be17a2 100644
--- a/library/HTMLPurifier/Printer.php
+++ b/library/HTMLPurifier/Printer.php
@@ -28,9 +28,9 @@ class HTMLPurifier_Printer
     
     /**
      * Main function that renders object or aspect of that object
-     * @param $config Configuration object
+     * @note Parameters vary depending on printer
      */
-    function render($config) {}
+    // function render() {}
     
     /**
      * Returns a start tag
@@ -66,6 +66,18 @@ class HTMLPurifier_Printer
                $this->end($tag);
     }
     
+    function elementEmpty($tag, $attr = array()) {
+        return $this->generator->generateFromToken(
+            new HTMLPurifier_Token_Empty($tag, $attr)
+        );
+    }
+    
+    function text($text) {
+        return $this->generator->generateFromToken(
+            new HTMLPurifier_Token_Text($text)
+        );
+    }
+    
     /**
      * Prints a simple key/value row in a table.
      * @param $name Key
diff --git a/library/HTMLPurifier/Printer/ConfigForm.css b/library/HTMLPurifier/Printer/ConfigForm.css
new file mode 100644
index 00000000..f9c9c936
--- /dev/null
+++ b/library/HTMLPurifier/Printer/ConfigForm.css
@@ -0,0 +1,7 @@
+
+.hp-config {}
+
+.hp-config tbody th {text-align:right;}
+.hp-config thead, .hp-config .namespace {background:#3C578C; color:#FFF;}
+.hp-config .namespace th {text-align:center;}
+.hp-config .verbose {display:none;}
diff --git a/library/HTMLPurifier/Printer/ConfigForm.js b/library/HTMLPurifier/Printer/ConfigForm.js
new file mode 100644
index 00000000..119ca4a0
--- /dev/null
+++ b/library/HTMLPurifier/Printer/ConfigForm.js
@@ -0,0 +1,3 @@
+function toggleWriteability(id_of_patient, checked) {
+    document.getElementById(id_of_patient).disabled = checked;
+}
\ No newline at end of file
diff --git a/library/HTMLPurifier/Printer/ConfigForm.php b/library/HTMLPurifier/Printer/ConfigForm.php
new file mode 100644
index 00000000..c579dd99
--- /dev/null
+++ b/library/HTMLPurifier/Printer/ConfigForm.php
@@ -0,0 +1,202 @@
+<?php
+
+require_once 'HTMLPurifier/Printer.php';
+
+class HTMLPurifier_Printer_ConfigForm extends HTMLPurifier_Printer
+{
+    
+    /**
+     * Printers for specific fields
+     */
+    var $fields = array();
+    
+    /**
+     * Documentation URL, can have fragment tagged on end
+     */
+    var $docURL;
+    
+    function HTMLPurifier_Printer_ConfigForm($doc_url = null) {
+        parent::HTMLPurifier_Printer();
+        $this->docURL = $doc_url;
+        $this->fields['default']    = new HTMLPurifier_Printer_ConfigForm_default();
+        $this->fields['bool']       = new HTMLPurifier_Printer_ConfigForm_bool();
+    }
+    
+    function render($config) {
+        $this->config = $config;
+        $all = $config->getAll();
+        $ret = '';
+        $ret .= $this->start('table', array('class' => 'hp-config'));
+        $ret .= $this->start('thead');
+        $ret .= $this->start('tr');
+            $ret .= $this->element('th', 'Directive');
+            $ret .= $this->element('th', 'Value');
+        $ret .= $this->end('tr');
+        $ret .= $this->end('thead');
+        foreach ($all as $ns => $directives) {
+            $ret .= $this->renderNamespace($ns, $directives);
+        }
+        $ret .= $this->end('table');
+        return $ret;
+    }
+    
+    function renderNamespace($ns, $directives) {
+        $ret = '';
+        $ret .= $this->start('tbody', array('class' => 'namespace'));
+        $ret .= $this->start('tr');
+            $ret .= $this->element('th', $ns, array('colspan' => 2));
+        $ret .= $this->end('tr');
+        $ret .= $this->end('tbody');
+        $ret .= $this->start('tbody');
+        foreach ($directives as $directive => $value) {
+            $ret .= $this->start('tr');
+            $ret .= $this->start('th');
+            if ($this->docURL) $ret .= $this->start('a', array('href' => $this->docURL . "#$ns.$directive"));
+                $ret .= $this->element(
+                    'label',
+                    "%$ns.$directive",
+                    array('for' => "$ns.$directive")
+                );
+            if ($this->docURL) $ret .= $this->end('a');
+            $ret .= $this->end('th');
+            
+            $ret .= $this->start('td');
+                $def = $this->config->def->info[$ns][$directive];
+                $type = $def->type;
+                if (!isset($this->fields[$type])) $type = 'default';
+                $type_obj = $this->fields[$type];
+                if ($def->allow_null) {
+                    $type_obj = new HTMLPurifier_Printer_ConfigForm_NullDecorator($type_obj);
+                }
+                $ret .= $type_obj->render($ns, $directive, $value, $this->config);
+            $ret .= $this->end('td');
+            $ret .= $this->end('tr');
+        }
+        $ret .= $this->end('tbody');
+        return $ret;
+    }
+    
+}
+
+class HTMLPurifier_Printer_ConfigForm_NullDecorator extends HTMLPurifier_Printer {
+    var $obj;
+    function HTMLPurifier_Printer_ConfigForm_NullDecorator($obj) {
+        parent::HTMLPurifier_Printer();
+        $this->obj = $obj;
+    }
+    function render($ns, $directive, $value, $config) {
+        $ret = '';
+        $ret .= $this->start('label', array('for' => "Null_$ns.$directive"));
+        $ret .= $this->element('span', "$ns.$directive:", array('class' => 'verbose'));
+        $ret .= $this->text(' Null/Disabled');
+        $ret .= $this->end('label');
+        $attr = array(
+            'type' => 'checkbox',
+            'value' => '1',
+            'class' => 'null-toggle',
+            'name' => "Null_$ns.$directive",
+            'id' => "Null_$ns.$directive",
+            'onclick' => "toggleWriteability('$ns.$directive',checked)" // INLINE JAVASCRIPT!!!!
+        );
+        if ($value === null) $attr['checked'] = 'checked';
+        $ret .= $this->elementEmpty('input', $attr);
+        $ret .= $this->text(' or ');
+        $ret .= $this->elementEmpty('br');
+        $ret .= $this->obj->render($ns, $directive, $value, $config);
+        return $ret;
+    }
+}
+
+class HTMLPurifier_Printer_ConfigForm_default extends HTMLPurifier_Printer {
+    function render($ns, $directive, $value, $config) {
+        $ret = '';
+        $def = $config->def->info[$ns][$directive];
+        if (is_array($value)) {
+            switch ($def->type) {
+                case 'lookup':
+                    $array = $value;
+                    $value = array();
+                    foreach ($array as $val => $b) {
+                        $value[] = $val;
+                    }
+                case 'list':
+                    $value = implode(',', $value);
+                    break;
+                case 'hash':
+                    $nvalue = '';
+                    foreach ($value as $i => $v) {
+                        $nvalue .= "$i,$v,";
+                    }
+                    $value = $nvalue;
+                    break;
+                default:
+                    $value = '';
+            }
+        }
+        if ($def->type === 'mixed') {
+            return 'Not supported';
+            $value = serialize($value);
+        }
+        $attr = array(
+            'type' => 'text',
+            'name' => "$ns.$directive",
+            'id' => "$ns.$directive"
+        );
+        if ($value === null) $attr['disabled'] = 'disabled';
+        if (is_array($def->allowed)) {
+            $ret .= $this->start('select', $attr);
+            foreach ($def->allowed as $val => $b) {
+                $attr = array();
+                if ($value == $val) $attr['selected'] = 'selected';
+                $ret .= $this->element('option', $val, $attr);
+            }
+            $ret .= $this->end('select');
+        } else {
+            $attr['value'] = $value;
+            $ret .= $this->elementEmpty('input', $attr);
+        }
+        return $ret;
+    }
+}
+
+class HTMLPurifier_Printer_ConfigForm_bool extends HTMLPurifier_Printer {
+    function render($ns, $directive, $value, $config) {
+        $ret = '';
+        
+        $ret .= $this->start('div', array('id' => "$ns.$directive"));
+        
+        $ret .= $this->start('label', array('for' => "Yes_$ns.$directive"));
+        $ret .= $this->element('span', "$ns.$directive:", array('class' => 'verbose'));
+        $ret .= $this->text(' Yes');
+        $ret .= $this->end('label');
+        
+        $attr = array(
+            'type' => 'radio',
+            'name' => "Yes_$ns.$directive",
+            'id' => "Yes_$ns.$directive",
+            'value' => '1'
+        );
+        if ($value) $attr['checked'] = 'checked';
+        $ret .= $this->elementEmpty('input', $attr);
+        
+        $ret .= $this->start('label', array('for' => "No_$ns.$directive"));
+        $ret .= $this->element('span', "$ns.$directive:", array('class' => 'verbose'));
+        $ret .= $this->text(' No');
+        $ret .= $this->end('label');
+        
+        $attr = array(
+            'type' => 'radio',
+            'name' => "No_$ns.$directive",
+            'id' => "No_$ns.$directive",
+            'value' => '0'
+        );
+        if (!$value) $attr['checked'] = 'checked';
+        $ret .= $this->elementEmpty('input', $attr);
+                
+        $ret .= $this->end('div');
+        
+        return $ret;
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/smoketests/all.php b/smoketests/all.php
index 743440be..de09412c 100644
--- a/smoketests/all.php
+++ b/smoketests/all.php
@@ -29,6 +29,7 @@ while (false !== ($filename = readdir($dh))) {
     if (strpos($filename, '.php') === false) continue;
     if ($filename == 'common.php') continue;
     if ($filename == 'all.php') continue;
+    if ($filename == 'testSchema.php') continue;
     ?>
     <iframe src="<?php echo escapeHTML($filename); ?>"></iframe>
     <?php
diff --git a/smoketests/configForm.php b/smoketests/configForm.php
new file mode 100644
index 00000000..ca32aabd
--- /dev/null
+++ b/smoketests/configForm.php
@@ -0,0 +1,66 @@
+<?php
+
+require_once 'common.php';
+
+if (isset($_GET['doc'])) {
+    require_once 'testSchema.php';
+    $new_schema = $custom_schema;
+    HTMLPurifier_ConfigSchema::instance($old);
+    define('HTMLPURIFIER_CUSTOM_SCHEMA', 'new_schema');
+    define('HTMLPURIFIER_SCRIPT_LOCATION', '../configdoc/');
+    require_once '../configdoc/generate.php';
+    exit;
+}
+
+?><!DOCTYPE html 
+     PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html>
+<head>
+    <title>HTML Purifier Config Form Smoketest</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+    <link rel="stylesheet" href="../library/HTMLPurifier/Printer/ConfigForm.css" type="text/css" />
+    <script defer="defer" type="text/javascript" src="../library/HTMLPurifier/Printer/ConfigForm.js"></script>
+</head>
+<body>
+<h1>HTML Purifier Config Form Smoketest</h1>
+<p>This file outputs the configuration form for every single type
+of directive possible.</p>
+<form id="htmlpurifier-config" name="htmlpurifier-config" method="get" action=""
+style="float:right;">
+<?php
+
+require_once 'HTMLPurifier/Printer/ConfigForm.php';
+
+// fictional set, attempts to cover every possible data-type
+// see source at ConfigTest.php
+require_once 'testSchema.php';
+
+// cleanup ( this should be rolled into Config )
+$get = isset($_GET) ? $_GET : array();
+$mq = get_magic_quotes_gpc();
+foreach ($_GET as $key => $value) {
+    if (!strncmp($key, 'Null_', 5) && !empty($value)) {
+        unset($get[substr($key, 5)]);
+        unset($get[$key]);
+    }
+    if ($mq) $get[$key] = stripslashes($value);
+}
+$config = @HTMLPurifier_Config::create($get);
+
+$printer = new HTMLPurifier_Printer_ConfigForm('?doc');
+echo $printer->render($config);
+
+?>
+<div style="text-align:right;">
+    <input type="submit" value="Submit" />
+    [<a href="?">Reset</a>]
+</div>
+</form>
+<pre>
+<?php
+print_r($config->getAll());
+?>
+</pre>
+</body>
+</html>
\ No newline at end of file
diff --git a/smoketests/testSchema.php b/smoketests/testSchema.php
new file mode 100644
index 00000000..1295566e
--- /dev/null
+++ b/smoketests/testSchema.php
@@ -0,0 +1,44 @@
+<?php
+
+// overload default configuration schema temporarily
+$custom_schema = new HTMLPurifier_ConfigSchema();
+$old = HTMLPurifier_ConfigSchema::instance();
+$custom_schema =& HTMLPurifier_ConfigSchema::instance($custom_schema);
+
+if (!class_exists('CS')) {
+    class CS extends HTMLPurifier_ConfigSchema {}
+}
+
+CS::defineNamespace('Element', 'Chemical substances that cannot be further decomposed');
+
+CS::define('Element', 'Abbr', 'H', 'string', 'Abbreviation of element name.');
+CS::define('Element', 'Name', 'hydrogen', 'istring', 'Full name of atoms.');
+CS::define('Element', 'Number', 1, 'int', 'Atomic number, is identity.');
+CS::define('Element', 'Mass', 1.00794, 'float', 'Atomic mass.');
+CS::define('Element', 'Radioactive', false, 'bool', 'Does it have rapid decay?');
+CS::define('Element', 'Isotopes', array('1' => true, '2' => true, '3' => true), 'lookup',
+    'What numbers of neutrons for this element have been observed?');
+CS::define('Element', 'Traits', array('nonmetallic', 'odorless', 'flammable'), 'list',
+    'What are general properties of the element?');
+CS::define('Element', 'IsotopeNames', array('1' => 'protium', '2' => 'deuterium', '3' => 'tritium'), 'hash',
+    'Lookup hash of neutron counts to formal names.');
+
+CS::defineNamespace('Instrument', 'Of the musical type.');
+
+CS::define('Instrument', 'Manufacturer', 'Yamaha', 'string', 'Who made it?');
+CS::defineAllowedValues('Instrument', 'Manufacturer', array(
+    'Yamaha', 'Conn-Selmer', 'Vandoren', 'Laubin', 'Buffet', 'other'));
+CS::defineValueAliases('Instrument', 'Manufacturer', array(
+    'Selmer' => 'Conn-Selmer'));
+
+CS::define('Instrument', 'Family', 'woodwind', 'istring', 'What family is it?');
+CS::defineAllowedValues('Instrument', 'Family', array(
+    'brass', 'woodwind', 'percussion', 'string', 'keyboard', 'electronic'));
+CS::defineValueAliases('Instrument', 'Family', array(
+    'synth' => 'electronic'));
+
+CS::defineNamespace('ReportCard', 'It is for grades.');
+CS::define('ReportCard', 'English', null, 'string/null', 'Grade from English class.');
+CS::define('ReportCard', 'Absences', 0, 'int', 'How many times missing from school?');
+
+?>
\ No newline at end of file
diff --git a/tests/HTMLPurifier/ConfigSchemaTest.php b/tests/HTMLPurifier/ConfigSchemaTest.php
index 8a20988f..56f23b76 100644
--- a/tests/HTMLPurifier/ConfigSchemaTest.php
+++ b/tests/HTMLPurifier/ConfigSchemaTest.php
@@ -288,6 +288,8 @@ class HTMLPurifier_ConfigSchemaTest extends UnitTestCase
         $this->assertValid(array(1 => 'moo'), 'hash');
         $this->assertInvalid(array(0 => 'moo'), 'hash');
         $this->assertValid('', 'hash', array());
+        $this->assertValid('foo,bar,too,two', 'hash', array('foo' => 'bar', 'too' => 'two'));
+        $this->assertValid('foo,bar,too', 'hash', array('foo' => 'bar'));
         
         $this->assertValid(23, 'mixed');